Why Are We Concerned at All with Monitoring Emerging/reemerging Diseases

Why are we concerned at all with monitoring emerging/reemerging diseases?

A) These represent growing threats to human health that will require new scientific research and resources to effectively combat.
B) Because globalization leads to more chances for spread of illnesses into new areas and populations. Monitoring these illnesses will help us to protect people.
C) Because the speed of travel has increased, so it is far more likely that a serious pathogen can spread rapidly across the globe. Monitoring these illnesses will help us protect populations.
D) All of the answer choices are correct.
E) None of the answer choices is correct.